Sibirana Castle in Zaragoza: Medieval Defense Structures Hidden in the

The Sibirana Castle, nestled in the municipality of Uncastillo, Zaragoza, is a testament to the strategic importance it held in the region centuries ago. It was built to control access from Uncastillo and Luesia to the Onsella river valley and eventually to Sos and Sangüesa, the Aragón river valley. Positioned on a steep and rocky peak, the castle has two towers that make approach from the south impossible. The castle entrance was from the north, via a wooden staircase that no longer exists, with the holes where the wooden stair supports were placed still visible in the rock.

Each tower had a square plan, divided into three floors raised on wood, and remained in excellent condition externally until the 2010s, retaining even their battlements. North of the towers, where access was more accessible, the lack of openings was a defensive strategy. Water supply for the castle came from the creek that runs at its foot, and food was acquired from the nearby lands, with livestock being a crucial source of subsistence.

Sources: Wikipedia, OpenStreetMap, Wikidata, Wikimedia Commons